Winfield scott



Patented Oct. 23, 1928 UNITED STATES PATENT. OFFICE.

by employing anisidyl and other alkoxy substituted mustard 'oils in place of phenetidyl mustard oil used in the example.-

The unsymmetrical di-substituted-guanidine produced as described has been used as a vulcanization accelerator in a so-called cushion stock compound comprising obtained:

Modulus ot elasticity Tensile at elongation ofstrength UB2;-a

at ma Time of cum break elonga- 300% 500% 700% lbsllln. on

30min.at2871".--. 168 378 1,42; 3,110 870% 00 min. at 287 F. 202 054 760 1 790% A vulcanized rubber product possessing a high tensile strength is seen from the above results to be obtained after heating for approximately one hour under the conditionsset forth.

The accelerator hereinbefore described has also been employed in a tread stock composition. Such a stock comprised:

36.5 parts smoked sheet rubber, 20 parts #2 amber crepe rubber, 25 parts carbon black, 2 parts sulphur, j

1 partlof a blended mineral and vegetable o1 1 part stearic acid, 3.5 parts mineral rubber, 11 parts zinc oxide, 0.5 part p-di-methyl-amino-phenyl-pphenetidyl-guanidine.

The above composition was compounded in the usual manner, and vulcanized by heating under the conditions hereinbefore set forth. Portions of the stock, heated as described for different periods of time, were tested and the following results were obtained: I

Modulus of elas- Teisfle 33:53, 6101188 strength Ultiat mate Time cum break I elongain tion 500% lbsJin.

1 hr. 15 min. at 287 F-.'-.. 1, 085 i 2, 820 3, 965 6557 1 hr. min. at 287 F 1,22) 2, 875 3, 940' 555 o The particular stock employing the preferred accelerator as set forth yields a vulcanized product possessing a high tensile strength and other desired properties after vulcanizing for approximately one hour and fifteen minutes.

A further example of a different type of rubber product produced by the use of the preferred accelerator is in the manufacture of a hard rubber. A rubber stock comprisin the following ingredients was compounde in the usual manner 20 parts #2 amber crepe rubber,

- 20 partssmoked sheetrubber,

5 parts lime, 17.5 parts zinc oxide, 27.5 parts sulphur, 10 parts mineral rubber,

0.5 part p-di-methyl-amino-phenyl-p-pheir.

etidyl-guanidine.

The above stock was found to yield a good hard rubber after heating ina press at 287 F. for approximately two hours and forty-five minutes. K

A so-called pure gum stock comprising parts pale crepe rubber, 5 parts zinc oxide, 3.5 parts sul hur, 0.5 part of t e accelerator employed in the previous examples was compounded and the stock vulcanized as before.

A cured product was obtained after heating for from thirty to forty-five minutes in a press maintain d .under a temperature of approximately 287 F. v

The examples hereinbefore. given are understood to be illustrative only and not at all limitative of. the scope of my invention.

Other examples illustrating the use of the e accelerator, set forth in various types of rubber products are apparent to those skilled in the art of rubber compounding. The invention is not limited to the use of an accelerator manufactured by the particular process as described, since the accelerator may be formed by properly employing. other methods practiced for the formation of the guanidine derivative desired. The invention is to be considered as limited only by the following [claims appended hereto and forming a art of this specification wherein I intend to c aim all novelty inherent in my invention as broadly as is permissible in view of the prior art.

It is apparent from the foregoing description that the compounds designated as d1s-. similar-aryl di-substituted guanidines'hereinbefore set forth as rubber vulcanization accelerators, preferably comprise guanidine derivatives wherein different aryl groups or substituted arylgroups-are substituted in place of two hydrogen atoms linked to two' difi'erent'nitrogen atoms: Such guanidines are of an entirely difierent type from those of p-di-methyl-amino-phenyl-pphenetidyl obtained. by replacing two hydrogen atoms at guamdine. tached to the same nitrogen atom by two dis- 2. A'vulcanized rubber roduct obtained by similar groups. i V heating a mixture of rub er and sulphur 1n 5 What I claim is: the presence of p-di-methyl-amino-phenyl-p- 1. The process of manufacturing Vulcanphenetidyl-guanidine. ized rubber which comprises heating a, mix- In testimony whereof I aflix my signature. ture of rubber and sulphur in the presence WINFIELD SCOTT. 

